FOOD AND FEEDING HABITS OF THE TWO SPECIES OF CHIROCENTRUS FROM MANDAPAM* G. LUTHER. Waltair Research Centre of CMFR Institute, ABSTRACT
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1 FOOD AND FEEDING HABITS OF THE TWO SPECIES OF CHIROCENTRUS FROM MANDAPAM* G. LUTHER Waltair Research Centre of CMFR Institute, Waltair. ABSTRACT The two species of Chirocentrus, C. nudus and C. dorab, examined from the Palk bay and Gulf of Mannar, appear to be diurnal predators preying mostly on fishes, depending for predation perhaps on vision. They seem to ingest the prey as a whole, swallowing its head first. When young, they feed mainly oil the postlarvae and juveniles of Stolephorous and Sardinella and on Acetes, but, as adult' they change over to adult sardines and other clupeoids. Though both the species belong to the same trophic level, C. nudus seems to avoid competition by feeding on relatively larger-sized prey, which they arc able to do with the help of their larger mouth and stronger teeth. INTRODUCTION The available information on the food and feeding habits of Chirocentrus from the Indian seas is the brief mentions by Chacko (1949), Devanesen and Chidambaram (1953), Venkataraman (1961), Basheeruddin and Nayar (1962) and Rabindranath (1966), all reportedly relating to C. dorab, but in all probability relating to a mixture of both the species, namdy, C. dorab and C. nudus, since both of them occur along the Indian coast with the latter more dominant in the catches (see Luther 1968). Therefore the food and feeding habits of the two species from the Palk Bay and Gulf of Mannar around the Rameswaram island were studied separately, and the results, together with a short description of the alimentary system of Chirocentrus, are given in this account. MATERIAL AND MBTHUS Samples from drift-net catches from the Palk Bay and Gulf of Mannar were examined once a week from July 1964 to June As relatively larger fish were more common in these catches, small-sized fish were examined from samples collected from the shore-seine catches around the Rameswaram Island during July 1967-June The drift-net samples were night catches Prom the author's thesis for Ph.D.
2 440 LUTHER and the shore-seine samples were day catches. Stomach contents of 5121 C. nudus ranging in fork length from 85 mm to 790 mm were examined. Out of them, 4076 fish, ranging between 180 mm and 790 mm length, were from drift nets and the rest, ranging in length from 85 mm to 350 mm, were from shore seines. Stomach contents of 1694 C. dorab, ranging from 127 mm to 664 mm fork length, were examined. Out of these, 1435 fish, ranging between 227 mm and 664 mm length, were from drift nets and the rest, ranging in length from 127 mm to 364 mm, were from shore seines. The stomach contents were examined in fresh condition. The intensity of feeding was determined for individual fish based on the distention of the stomach and the amount of food contained therein (Pillay 1952). The intensity of feeding was classified, by eye estimation, as 'gorged', 'full', 'J full', 'i full', 'i full', 'a little' and 'empty'. The first four conditions were taken as indicators of "active" feeding and the last three conditions as "poor" feeding. The food components were identified up to generic or even specific level, wherever possible, and the occurrence of each category was recorded. The examination of the data has shown that there was no significant variation in the quality of prey or in the intensity of feeding among the different seasons or among the different maturity stages of the fish. However, there were some evident variations between the fish caught during night and those caught during day and also between those caught from Gulf of Mannar and those caught from the Palk bay. Hence the data for night and day catches, separately for the two localities, were segregated and analysed by the Occurrence method. Food Habits of C. nudus The wide gape of mouth; the jaws bearing sharp, curved caniniform teeth; the thick, short gill rakers; and the simple, short alimentary canal all illustrate the predaceous nature of both the species of Chirocentrus. Fishes were the main food of C. nudus (Table 1). Cephalopods of the genera Sepia, Sepioteuthis and Loligo were met with occasionauy in fish caught in drift net, and shrimp Acetes was met with frequently in fish caught in shore seine catches. Species of Sardinella ranked first in importance, with Stolephorus and leiognathids ranking next, in fish caught in drift nets. However, C. nudus was found to consume a variety of other fishes, too, such as Dussumieria, Thryssa, Sphyraena, Tricfuurus, Lethrinus, Atherina, Hilsa, Pellona, Anodotostoma, carangids, hemirhamphids, grey mullets and even young ones of Chirocentrus. Though fishes formed the main food item of C. nudus also from the shore seine catches, the fishes here were mainly postlarvae and early juveniles. This difference in the size of prey in fish from the two types of gear might be
3 FOOD AND FEEDING OF CHIROCENTRUS 441 TABLE 1. Food component^ in percentage of C. nudus from the -Palk Bay and the Gulf of Mannar in night catches by drift net, and day catches by shore seines. Size Partly range No. of Sofdi- Stole- Leiog- Sphy- Other Cepha- digested Year (mm) fish nsla phorus nathus raena fishes Acetes lopods matter Palk Bay: Night catches Gulf of Mannar: Night catches les Palk Bay: Day catehei , Gulf of Mannar: Day catches due to the difference in the size of C. nudus caught in the two gears (Table 1). Further, Stolephorus forme^ the chief item consumed by fish obtained from shore seine. The other main items of food were Acetes, Sardinella and Sphyraena. Postlarvae of fish such as Elops, Megalops, Saurida, Sillago, Therapon, Atherina and carangids, were also at imes observed. Food in relation to size of fish: Though the individual stomachs indicated that fish formed the main food of individuals examined in the length range mentioned earlier, fish between 85 and 350 mm length were found to feed on postlarvae and early juveiile fishes, mainly of Stolephorus, Sardinella and Sphyraena, and on the small shrimp Acetes. Stomachs of fish below 350 mm length examined from drift net catches had either partly digested food or were empty. Hence no comparison could be made of the food components of smallsized fish caught during day and night. But large-sized C. nudus appeared to feed on large-sized fishes, tpe size of the prey increasing with the size of the predator. Though fishes up to mm standard length were observed in the stomachs of large-sized (fish, mm were the common size of prey in C. nudus exceeding 350 mnii fork length.
4 442 LUTHER Feeding habits and feeding grounds: C. nudus caught at night in drift net usually had in their stomachs either 1-4 fish of the same species, or varying amounts of partly digested material, mosdy fish. Small-sized C. nudus occurring in the shore seine catches (day), however, were found usually to contain more than one category of food item, presumably because these items had occurred in an assemblage. Irrespective of size of the prey, the stomach contents of an individual usually were in the same state of digestion, perhaps indicating that C. nudus feeds at intervals of time. The fish appeared to ingest the prey as a whole starting with its head, for the heads of the fish, with very few exceptions, were found toward the blind end of the pouch-like stomach. Medium-sized Trichiurus when eaten was found in the stomach in a folded condition with both its head and tail toward the oesophagus. This method of ingestion, namely, swallowing the head of the prey first, seems to be an adaptive behaviour of the predator in order to prevent the prey's fin spines' possible interference while swallowing. About 70% of stomachs of the fish examined from drift net catches (night) were empty (Table 2), whereas only 20% of them from shore seines (day) were in this condition. This difference in the occurrence of empty stomachs in fish caught during night and day indicates a low feeding activity of the fish during night. To examine this aspect further, a comparison was made TABLE 2. Condition of feeding (% occurrence) of C. nudus in the Palk Bay and the Gulf of Mannar in the night catches by drift net, and in the day catches by shore seine. Size range No. of (mm) fish Gorged Full * fuu Hull i full Little Empty Palk Bay: Night catches Gulf of Mannar: Night catches Pallc Bay: Day catches U.l 15.8 Gulf of Mannar: Day catches ,
5 FOOD AND FEEDING OF CHIROCENTRUS 443 of the proportions of fish in poor feeding activity in samples obtained during night and day. This gave a test statistic (d) (Bailey 1959) of ( > 1.96) indicating a significant difference between the two proportions. The feeding intensity of fish would naturally be lower during night than during day. Occurrence of semidigested matter to the extent of about 50% in fish caught at night and only about 10% in those caught during day also would point to the same possibility. Also, whereas fish with gorged stomach were present in day catches they were absent in night catches. However, fish with i full stomach were common both in night and in day catches, forming 15.8% and 26.9% respectively. Actively fed fish formed 7.7% in the night catches and 24% in day catches. These figures, besides pointing out the higher feeding activity during day time, would indicate that the fish feeds only moderately at a time. Incidence of empty stomachs was higher in Gulf of Mannar than in the Palk Bay, in both night and day catches. Similarly, poorly fed fish were more in the Gulf of Mannar than in the other locality. This variation in the feeding intensity between the two localities was statistically tested by comparing the proportion of fish in poor feeding condition from the two localities for the night and day catches separately. The test statistic (d) obtained were 9.2 (> 1.92) for night samples, and 5.0 ( > 1.96 for day samples, indicating significant difference. Thus the feeding intensity of the fish seems to be significantly higher in Palk Bay than in Gulf of Mannar, indicating the probability of Palk Bay's forming a more important feeding ground for C. nudus. Food Habits of C. dorab C. dorab seems to have a food habit almost similar to C. nudus, the difference being only in the relative proportion of certain food items consumed (Table 3). Large-sized fish examined from drift net catches were found to have consumed mainly fishes, the chief item being sardines. In this species, unlike in C. nudus, Sardinella albella and S. gibbosa were the most common sardines met with, and, as in C. nudus, Stolephorus and Leiognathus were the next in importance, But, unlike in C. nudus, in this only small-sized fish of fewer groups, such as Dussumieria, Thryssa, Atherina and carangids, were met with. Further, the occurrence of cephalopods, Sepia, Sepioteuthis and Loligo, as also of Leiognathids, was found to be slightly higher in C. dorab. The smallsized C. dorab examined from shore seines were having post-larval fishes and Acetes as in the case of C. nudus. However, the proportion of Acetes consumed was higher in this species than in C. nudus. But for this there appears to be very little variation in food between the small-sized fishes of the species. Food in relation to the size of fish: Similarly as in C. nudus, larger-sized fish C. dorab fed on larger sized food organisms, and fish in mm length
6 444 LUTHER TABLE 3. Food components in percentage of C. dorab from the Palk Bay and the Gulf of Mannar in night catches by drift net, and day catches by shore seine. Year Size range (nun) No. of fish Other fishes Sardinella Stolephorus Leiognathiis Sphyraena Partly Cepha- digested Acetes lopods matter Palk Bay: Night catches Culf of Mannar: Night catches Palk Bay: Day catches Gulf of Mannar: Day catches range fed on postlarvae and early juveniles of fishes and on Acetes. As the stomach of the small fish examined from drift net catches were either empty or with partly digested food no comparison was possible between the foods of the small sized fish from the two types of gear. Feeding habits and feeding grounds: The ranges in the numbers of food items of C. dorab in the night catches and the day catches, as well as the position of the prey in the stomach, were almost the same as obiserved in the other species. In the night catches by drift net, about 75% of the fish had empty stomach and about 42% had partly digested food (Table 4). But in the day catches by shore seine, only 24% of fish had empty stomach and 10% had digested food. These show a lower feeding activity of the fish during night. As in the case of C. nudus, the general condition of feeding was better in fish caught in the Palk Bay than in the Gulf of Mannar. This is borne out by the occurrence of fish in active state of feeding of about 32% from drift, net catches and 56% from the shore seines in the Palk Bay as compared to 20% from the drift net catches and 40% from shore seines in the Gulf of Mannar, indicating that Palk Bay was the main feeding ground for C. dorab also.
7 FOOD AND FEEDING OF CHIROCENTRUS 445 TABLE 4. Condition of feeding (% occurrence) of C. dorab in the Palk Bay and the Gulf of Mannar in the night catches by drift net, in the day catches by shore seine. Size range No. of (mm) fish Gorged Full f full ifuu * full Little Empty Palk Bay: Night catches Gulf of Mannar: Night catches Palk Bay: Day catches Gulf of Mannar: Day catch les REMARKS In a general account of the food and feeding habits of the fishes of the Gulf of Mannar, Chacko (1949) described C. dorab as a carnivorous fish actively predaceous at surface and mid water. From the examination of 199 fish of cm length, he found its food as comprising Sardinella gibbosa, Engraulis sp., Stelephorus sp., Dussumieria hasselti and Trichiurus savala. Devanesan and Chidambaram (1953) reported C. dorab as feeding on other small pelagic fish such as sardines {Dussumieria, Sardinella gibbosa, etc.) silver bellies {Leiognathus and Gazza), young ribbon fishes, prawns and young eels (Leptocephali). During the course of his studies on the food and feeding relationships of the inshore fishes off Calicut, Venkataraman (1961) found Stolephorus heterolobus and 5. commersonii besides fragments of prawns. Basheerudin and Nayar (1962) found the juvenile Chirocentrus of the coastal waters of Madras feeding on Stolephorus sp., juvenile Lactrius lactarius, young ones of other fishes and also small dorabs. Rabindranath (1966), while dealing with the biology and seasonal distribution of the pelagic food fishes of Travancore coast, described the food of C. dorab 6f cnii length range, as comprising mainly anchovies and occasionally young ones of Saurus indicus and large sized Loligo. He also observed about 44% of C. dorab to be with empty stomach. The present observations have shown that in the Palk Bay and the Gulf of Mannar the younger ones of these two species feed mainly on postlarvae and
8 446 LUTHER juveniles of Stolephorus and Sardinella as well as on Acetes and, on their growing larger, they take mainly to sardines apart from a number of other fishes and cephalopods. Thus both the species of Chirocentrus may be considered to be chiefly piscivorous, feeding mainly on clupeoids. And both the species appear to forage at the same trophic level and compete for the same food item, though C. nudus, with its larger gape of mouth, stronger teeth and pharyngeal armature, and a more voluminous stomach, is able to feed on fishes of larger size. Predaceous fish, according to several authors (as quoted by Popova 1967), may be divided into two groups on the basis of their method of finding and procuring food: diurnal and nocturnal predators. In the former group it is vision that plays the main role in capturing prey, whereas in the latter group it is the senses of smell, touch and the lateral line organs. If so, Chirocentrus can be regarded as diurnal predators depending mainly on vision to catch their prey, since it was in the fish caught during day time that greater feeding activity was evident. ACKNOWLEDGEMENT The author expresses his grateful thanks to Dr. S. Jones, former Director of C.M.F.R. Institute, for supervision of this work; to Dr. E. G. SUas, Director, for encouragement and to Shri K. V. Narayana Rao, for critically going through the manuscript. REFERENCES BAILEY, N. T. J Statistical Methods in Biology. The English University Press Ltd., London. BASHEERUDHIN, S. AND K. N. NAYAR A preliminary study of the Juvenile fishes of the coastal waters off Madras City. Indian J. Fish., 1961, 8(1): CHACKO, P. I Food and feeding habits of the fishes of the Gulf of Mannar. Proc. Indian Acad. Sci., 29B (3): DEVANESAN, D. W. AND K. CHIDAMBARAM The Common Food Fishes of the Madras State. Dept. Industries & Commerce, Madras 79 pp. LUTHER, G On the little known fish, Chrocentrus nudus Swainson from the Indian seas, and its comparison with Chirocentrus dorab (Forskal). /. Mar. biol. Ass. India, 1966, 8(1): PiLLAY, T. V. R A critique of the method of study of food of fishes. /. Zool. Sac. India. 4(2): J PopovA, O. A The 'Predator-prey' relationship, among fishes (A survey of Soviet papers), pp In: The Biological Basis of Frashwater Fish Production. (Oerking S.D. ed.) Blackwell Scientific Publications, Oxford, Edinburgh. RABINDRANATH, P Biology and Seasonal Distribution of the Pelagic Food Fishes of Travancore coast. Kerala University Publications, 140 pp. VENKATARAMAN, G Studies on the food and feeding relationships of the inshore fishes off Calicut on the Malabar Coast. Indian J. Fish., 1960, 7(2):
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